A FACILE ONE STEP SYNTHESIS OF [3-(2-HYDRAZINO-4-THIAZOLYL) COUMARINO] DIMETHYL METHINES AND SOME 3-SUBSTITUTED-7H-6-(6/8,6,8-SUBSTITUTED-3-COUMARINO)-S-TRIAZOLO[3,4-b][1,3,4]THIADIAZINES

Synthesis, photophysical and electrochemical properties of donor–acceptor type hydrazinyl thiazolyl coumarins

A practical green MCR strategy has been developed for the synthesis of D–A type hydrazinyl thiazolyl coumarins catalyzed by an environmentally compatible MMT K10 clay in water at RT.

Molecular Iodine Mediated One Step Synthesis of 3-Substituted-6-(6-Substituted-2-Oxochromen-3-yl)-7H [1,2,4]Triazolo[3,4-b][1,3,4]Thiadiazines

Iodine mediated condensation of 3-acetyl-6-substitutedcoumarin (1) with 3-alkyl/aryl-4-amino-5-mercapto[1,2,4]triazoles (2) have been found to give 3-alkyl/aryl-6-(6-substituted-2-oxochromen-3-yl)-7H[1,2,4]triazolo[3,4-b][1,3,4]thiadiazines (3a-n) directly in one step. The reaction has also been carried out using microwave irradiation. This protocol is an improvement on reported methods as it occurs in a single step and avoids the use of highly lachrymatory molecular bromine.